I dropped 4Gb of RAM and a 128GB OCZ SSD into my 2008 15" Macbook Pro (2.4GHz core 2 duo). Didn't stop me replacing it with a 13" Macbook Air and not looking b

I dropped 4Gb of RAM and a 128GB OCZ SSD into my 2008 15" Macbook Pro (2.4GHz core 2 duo). Didn't stop me replacing it with a 13" Macbook Air and not looking back. The MBA has the same RAM, double the SSD capacity (I went large), same pixel count, and weighs about half as much. It also has about 50% greater battery life and feels screamingly faster. I surmise that enough of the GUI is running on the GPU that the significantly higher core count in the GeForce 320M is responsible for a chunk of the speed-up -- and the MBA's SATA-II bus running at up to 3gbps seems to be just a little nippier than the 2008 MBP with a 1.5gbps SATA-I controller and an older SSD.